US4259869A - Method and apparatus for inspection and fail-safe control of threaded joint tightening processes - Google Patents

Method and apparatus for inspection and fail-safe control of threaded joint tightening processes Download PDF

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Publication number
US4259869A
US4259869A US05/946,964 US94696478A US4259869A US 4259869 A US4259869 A US 4259869A US 94696478 A US94696478 A US 94696478A US 4259869 A US4259869 A US 4259869A
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Prior art keywords
torque
signal
signals
limits
fastener
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US05/946,964
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English (en)
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Carl-Gustaf Carlin
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Atlas Copco AB
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Atlas Copco AB
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed

Definitions

  • This invention relates to a method for inspection and fail-safe control of threaded joint tighteing processes as well as an apparatus for carrying out of said method.
  • the main object of the invention is to check the torque values and angular positions of the joint against predetermined limits over the main part of the tightening process, thereby enabling premature discovery of faults in the joint that would result in a weaker joint when the tightening is completed or in damage to the parts being joined.
  • Other objects of the invention are to provide maximum and minimum limits of a wider fail-safe control range, and high and low limits of a narrower check range embraced by said wider control range, to use the limits of said control range to obtain a primary inspection of the tightening process and/or to accomplish a premature interruption of the tightening process in case the actual torque-angular position values get outside the control range, and to store the actual torque-angular position values and to check them later on against said narrower check range limits.
  • FIG. 1 shows a diagram illustrating for a certain type of threaded joint the nominal torque-angular position curve as well as the fail-safe control and check ranges.
  • FIG. 2 shows schematically an apparatus for inspection and fail-safe control of threaded joint tightening processes in accordance with the invention.
  • FIG. 3 shows another apparatus according to the invention.
  • FIG. 1 there is illustrated the nominal torque-angular position curve for a threaded joint of the type that is going to be tightened. Previous tightenings of joints of the same type have given material for setting up this nominal curve. The slope of the curve corresponds to the experienced mean value for the joint stiffness, i.e. the nominal torque rate.
  • the inspection is started as a predetermined threshold torque level is passed and is continued over the rest of the tightening process. Practically, the inspection is carried out in such a way that a vast number of check points, the spacing of which is determined by the resolution of the angular encoder normally used in these applications, are established along the nominal curve, nd for each of the check points the transitory value of the torque transferred to the joint at the corresponding angular position are compared with predetermined maximum and minimum limit values representing a wider fail-safe control range.
  • the tightening will continue until it is completed, i.e. to a predetermined torque value or any other criteria. If there is something seriously wrong with the joint and the fail-safe control range limits are passed, an indication is obtained and the tightening could be automatically interrupted.
  • the tightening is completed to the predetermined final torque without any indications.
  • the torque-angular position values are stored, and, after the tightening is completed, they are compared with the high and low limit values of a narrower check range, illustrated in dotted-dash lines in FIG. 1.
  • the boundaries of the check range may be nonlinear in order to closer follow the actual characteristic of the process. This is particularly useful when tightening a joint beyond the yield point.
  • the comparison of the transitory values of the process and the predetermined high and low limits therefore, has to be calculated and requires computer assistance. It is possible not only to obtain information about the high and low limits being passed or not, but also to what extent if they are. The result may be obtained in the form of numbers of curves shown on a screen or on a tape or by other means.
  • FIG. 2 there is shown an example of an apparatus by which the inspection of the tightening process may be carried out.
  • the apparatus comprises a torque delivering power tool T having built-in sensing and encoding means (not shown) for delivered torque as well as angular displacement for producing an analogue torque signal and a pulse train, in which each pulse corresponds to a specific amount of rotation of the power tool spindle and thereby the fastener e.g. one degree.
  • the torque and rotation related signals are delivered via inputs 10 and 11, respectively, to a control unit C.
  • the angular displacement sensing means is connected to a pulse counter 12 and a digital-to-analogue, D/A, converter 13. To the D/A convverter there is also connected a set-point potentiometer 14 by which the apparatus is set to the nominal torque rate which corresponds to the joint stiffness which could be expected from the actual joint.
  • the control unit C of the apparatus further comprises sections for comparing the acceptable tolerances, which could be either independent of the rotation, ⁇ M + and ⁇ M - , or proportional thereto, ⁇ M% + and ⁇ M% - , or both.
  • the independent tolerances ⁇ M + and ⁇ M - are set on potentiometers 15 and 16 respectively, whereas the proportional tolerances ⁇ M% + and ⁇ M% - are set on the potentiometers 17 and 18, respectively.
  • the control unit C further comprises an analogue inverter 19 for changing the sign of the offset signal so as to obtain that part of the fail-safe control range that is below the nominal torque rate curve.
  • the apparatus comprises two summing amplifiers 20 and 21 by which the actual torque signal is compared with the nominal torque and the offset values added thereto.
  • the summing amplifiers 20 and 21 deliver positive or negative signals in response to the control range limits being passed to bistable threshold comparators or flip-flops 22 and 23, respectively.
  • the flip-flops 22 and 23 indicate a faulty condition in the joint being tightened by means of indication lamps 24 and 25 and/or initiate ceasing of the tightening process.
  • the signal representing the actual torque is subtracted from a sum formed by the nominal torque value and the offset values, and because of that the signal corresponding to the actual torque is given a negative sign in an analogue inverter 26.
  • the control unit C does not begin operating until a predetermined torque threshold is reached, and in order to obtain such a threshold the apparatus comprises a set-point potentiometer 27, a detector 28 and a gate 29 to let through the pulse train representing the rotation of the fastener being tightened.
  • the threshold detector 28 activates the gate 29. This allows the pulses from the angle encoder to pass through the gate 29 into the pulse counter 12. The sum of pulses in the pulse counter 12 will thereby, at any given moment of time correspond to the angular rotation of the fastener above the threshold torque level.
  • This sum represented by a digital number is converted to an analogue signal, corresponding to the expected torque value at the same point of rotation for a nominal or average fastener used in this specific application, by means of the multiplying D/A converter 13, which accepts input values from the pulse counter 12 and multiplying them with a reference signal obtained from the potentiometer 14 which signal corresponds to the average torque-rate of the joint being tightened.
  • the summing amplifier 20 a signal corresponding to the difference between the upper fail-safe control values as a function of rotation and the actual torque values at corresponding points of rotation is obtained.
  • the output from the summing amplifier 20 corresponds to the difference between the upper fail-safe control limit and the actual torque value applied to the fastener at any given point of rotation after the torque threshold has been reached. If this signal, which is normally positive, goes negative, this means that the actual torque value has exceeded the upper fail-safe control limit and a defective joint is present.
  • This change in sign of the signal output from the summing amplifier 20 is detected by a threshold comparator 22, which gives an output signal to indicate that the joint is defective. This signal can be used to drive an indicating lamp 24, or to shut off the nut runner or give any other kind of alarm, e.g. by acoustical means.
  • the threshold detector 22 also comprises a memory function so that its output is active until a major system reset signal is received, in order to keep the alarm active, even if the actual torque signal at some later points of rotation goes below the upper fail-safe control limit.
  • This summing amplifier 21 accepts inputs comprising: the expected torque signal from the D/A converter 13, a negative fixed offset signal ⁇ M - , obtained from the set-point potentiometer 16, a negative offset signal ⁇ M% - , corresponding to the expected torque values, obtained by changing the sign of the output from the D/A converter 13 by means of the analogue inverter 19 and feeding this signal to the set-point potentiometer 18 the output of which is fed to amplifier 21 and the actual torque value with a changed sign.
  • the output from the summing amplifier 21 will then correspond to the difference between the lower fail-safe control range and the actual torque values obtained from the fastener being tightened at any given point of rotation. For a normal joint this signal will always be negative. If the actual torque value should fall below the lower control range, the output from the summing amplifier 21 goes positive and this change will cause the threshold detector 23 to give an output causing alarms and/or shut-off of the nut runner as mentioned above.
  • FIG. 3 there is shown another embodiment of the apparatus according to the invention.
  • this apparatus comprises a torque delivering tool, like a nut runner T and a control unit C.
  • the nut runner T comprises torque sensing and signal delivering means as well as a rotation reponsive pulse generator.
  • the signal and pulses obtained thereby are fed into the control unit C' via inputs 31 and 32, respectively.
  • the control unit C' comprises a D/A converter 33 connected to input 32, a memory 34 and a computing unit 35.
  • the computing unit 35 communicates with the memory 34 via a databus 36 and an address bus 37.
  • the memory 34 also communicates with a pulse counter 38 which in turn is connected to the input 31 via a gate 39. The latter is arranged to let through angle pulses when receiving an opening signal from a threshold detector 40 which is connected to a set-point potentiometer 41.
  • indicating lamps 42, 43 and 44, 45 to show whether the fail-safe control and check ranges are passed during tightening of a screw joint.
  • the torque signal is fed via input 32 to the A/D converter 33 which in turn is coupled to the memory 34.
  • the torque signal is also fed to the threshold detector 40 which also accepts an input from the set-point potentiometer 41 so that an output signal is achieved when the torque threshold level is reached.
  • This signal opens the gate 39 to let the angle pulses arrive through input 31 into counter 38 which also is connected with the memory 34.
  • the computing unit 35 e.g. a microprocessor, can retrieve data stored in the memory 34 through the databus 36 by making a request through the address bus 37.
  • the computing unit 35 has in its program memory (not shown) instructions and limit values stored in order to perform the mathematical functions on the torque and angle datas as they are generated by the torque transducer and angle encoder and stored in the memory.
  • the indicating lamps 44 and 45 correspond to the indicating lamps 24 and 25 in the above described embodiment of FIG. 2. The functions obtained by the circuit shown in FIG. 2 can therefore also be performed by the unit shown in FIG. 3.
  • An advantage of the unit shown in FIG. 3 is that it can, after the tightening has been finished, put check range limits on torque-angle relationship obtained from each tightening. This can be done by letting the computer generate a straight line from the threshold point to the final torque/angle coordinate or to any other torque-coordinate on the actual torque-angle curve. The slope of this generated line would generally differ from the nominal torque-angle curve as used in relation to the device according to FIG. 2, although the average of many in such a way generated lines would correspond to the nominal relationship.
  • check-range limits are shown as straight lines, parallel to the average torque-rate line in FIG. 1. It is, however, obvious that the computing device 35, if sophisticated enough could generate any kind of piecewise linear or non-linear check range limits.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
US05/946,964 1977-10-07 1978-09-29 Method and apparatus for inspection and fail-safe control of threaded joint tightening processes Expired - Lifetime US4259869A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7711273 1977-10-07
SE7711273A SE412647B (sv) 1977-10-07 1977-10-07 Sett och anordning for overvakning och styrning av skruvforbandsatdragning

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US05/946,964 Expired - Lifetime US4259869A (en) 1977-10-07 1978-09-29 Method and apparatus for inspection and fail-safe control of threaded joint tightening processes

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US (1) US4259869A (it)
JP (1) JPS5467300A (it)
BR (1) BR7806648A (it)
DE (1) DE2843810C3 (it)
FR (1) FR2405476A1 (it)
GB (1) GB2006963B (it)
IT (1) IT1106553B (it)
SE (1) SE412647B (it)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4375123A (en) * 1980-04-07 1983-03-01 Sps Technologies, Inc. Method and apparatus for tightening threaded fastener assemblies
US4375122A (en) * 1980-04-07 1983-03-01 Sps Technologies, Inc. Method and apparatus for tightening threaded fastener assemblies
US4450727A (en) * 1982-04-29 1984-05-29 Gse, Inc. Digital retorque measuring apparatus
US4520446A (en) * 1981-12-25 1985-05-28 The Japan Steel Works, Ltd. Apparatus for controlling a plurality of stud tensioning devices
US4667389A (en) * 1985-03-01 1987-05-26 Hasha Brian B Apparatus and method for connecting two threaded members
US4845998A (en) * 1988-02-01 1989-07-11 Kent-Moore Corporation Apparatus for precision tensioning of threaded fasteners
US5131130A (en) * 1990-10-09 1992-07-21 Allen-Bradley Company, Inc. Torque-angle window control for threaded fasteners
US5212862A (en) * 1990-10-09 1993-05-25 Allen-Bradley Company, Inc. Torque-angle window control for threaded fasteners
US5402688A (en) * 1993-03-17 1995-04-04 Sumitomo Metal Industries, Ltd. Method and apparatus for determining the tightened condition of a pipe joint
US5615130A (en) * 1994-12-14 1997-03-25 Dallas Semiconductor Corp. Systems and methods to gather, store and transfer information from electro/mechanical tools and instruments
GB2339911A (en) * 1998-07-20 2000-02-09 Univ Bristol Apparatus and method for measuring the resistance to rotation of a dental implant.
US6502458B1 (en) * 1995-11-14 2003-01-07 Siemens Aktiengesellschaft Method for checking the operational readiness of a valve
EP2340424A4 (en) * 2008-10-22 2015-03-04 Atlas Copco Ind Tech Ab TEST METHOD AND TOOL TO TEST FIXED FASTENINGS
CN106500903A (zh) * 2016-09-19 2017-03-15 北京大学 一种基于扭矩信号的特殊扣拧接质量的监测方法
CN113358266A (zh) * 2021-06-29 2021-09-07 神龙汽车有限公司 螺栓装配张紧力测试方法
SE2330062A1 (en) * 2023-02-07 2024-08-08 Atlas Copco Ind Technique Ab Control device and method for setting upper and lower limit curves for one or more tools arranged to apply fasteners

Families Citing this family (20)

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Publication number Priority date Publication date Assignee Title
GB2098740A (en) * 1981-05-18 1982-11-24 Ford Motor Co Monitoring threaded joint tightening
DE3151265C2 (de) * 1981-12-24 1984-03-29 Bayerische Motoren Werke AG, 8000 München Prüfverfahren für eine Schraubenverbindung und Vorrichtung zur Durchführung des Verfahrens
JPS5937063A (ja) * 1982-08-24 1984-02-29 トヨタ自動車株式会社 動力式ねじ締付装置の駆動停止制御方法
JPS5937064A (ja) * 1982-08-24 1984-02-29 トヨタ自動車株式会社 ねじ対偶品の締付方法
DE3305457A1 (de) * 1983-02-17 1984-08-23 Schatz Testronic GmbH, 5630 Remscheid Verfahren und vorrichtung zum pruefen von kraftschraubern
JPS59219172A (ja) * 1983-05-25 1984-12-10 トヨタ自動車株式会社 ねじ締結方法
JPS6056873A (ja) * 1983-09-06 1985-04-02 東京貿易株式会社 ボルト・ナットの締付方法
EP0170068B1 (en) * 1984-06-29 1991-09-04 Kabushiki Kaisha Komatsu Seisakusho Bolt fastening method
DE3511400A1 (de) * 1985-03-29 1986-10-02 Dr. Staiger, Mohilo + Co GmbH, 7060 Schorndorf Verfahren zum ueberwachen des eindrehvorgangs einer schraube
DE3710512A1 (de) * 1987-03-30 1988-10-20 Bosch Gmbh Robert Schraubverfahren und schrauber zum automatischen anziehen von schrauben und/oder muttern
JPH01146670A (ja) * 1987-12-02 1989-06-08 Yutani Tekko Kk 締付工具のカジリ判定装置
CA1332970C (en) * 1988-09-21 1994-11-08 Akira Takeshima Nut runner control system and method of monitoring nut runners
US5229931A (en) * 1988-09-21 1993-07-20 Honda Giken Kogyo Kabushiki Kaisha Nut runner control system and method of monitoring nut runners
DE4118595C2 (de) * 1991-06-06 1996-05-15 Schatz Gmbh Prüfgerät zum Überprüfen der Qualität von Schraubverbindungen
US5315501A (en) * 1992-04-03 1994-05-24 The Stanley Works Power tool compensator for torque overshoot
DE4243069C2 (de) * 1992-12-18 2001-09-27 Gardner Denver Gmbh Impulswerkzeug, insbesondere Impulsschrauber
DE19755253A1 (de) * 1997-12-12 1999-06-17 Deutz Ag Verfahren zum kontrollierten Anziehen einer Schraubverbindung
DE19961374A1 (de) * 1999-12-20 2001-06-21 Volkswagen Ag Vorrichtung zum Herstellen von Schraubverbindungen
DE102008008992A1 (de) * 2008-02-13 2009-08-20 CORONET Kleiderbügel & Logistik GmbH Drehmoment-Prüfvorrichtung für einen Aufhängehaken eines Kleiderbügels
RU2598974C1 (ru) * 2015-06-04 2016-10-10 Закрытое акционерное общество "ИНСТРУМ-РЭНД" Способ затяжки резьбовых соединений динамометрическим ключом с гироскопическим датчиком угла поворота, установленным в корпусе ключа и динамометрический ключ для его осуществления

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US4091451A (en) * 1977-04-26 1978-05-23 Weatherford/Lamb, Inc. Method of and apparatus for making up a threaded connection
US4106176A (en) * 1977-04-06 1978-08-15 Ingersoll-Rand Company Method and apparatus for fastener tensioning

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JPS4956299A (it) * 1972-09-30 1974-05-31
JPS4977299A (it) * 1972-11-28 1974-07-25
US3962910A (en) * 1973-08-20 1976-06-15 Ingersoll-Rand Company Method and apparatus for fastener tension inspection
FR2265501A2 (en) * 1974-03-27 1975-10-24 Standard Pressed Steel Co Appts. for driving a screw fastener - stops when torque-rotation curve gradient reaches set value
JPS514717A (it) * 1974-06-28 1976-01-16 Nissan Motor
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US3939920A (en) * 1974-09-19 1976-02-24 Standard Pressed Steel Co. Tightening method and system
US3974883A (en) * 1975-05-19 1976-08-17 Standard Pressed Steel Co. Tightening system
DE2600939C2 (de) * 1976-01-13 1990-01-25 SPS Technologies, Inc., Jenkintown, Pa. Schaltungsanordnung für eine Vorrichtung zum Anziehen einer Verbindung von Bauteilen, insbesondere einer Schraubverbindung
US4102182A (en) * 1976-05-05 1978-07-25 Ford Motor Company Quality checking system for a threaded fastener assembly

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Publication number Priority date Publication date Assignee Title
US4106176A (en) * 1977-04-06 1978-08-15 Ingersoll-Rand Company Method and apparatus for fastener tensioning
US4091451A (en) * 1977-04-26 1978-05-23 Weatherford/Lamb, Inc. Method of and apparatus for making up a threaded connection

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4375123A (en) * 1980-04-07 1983-03-01 Sps Technologies, Inc. Method and apparatus for tightening threaded fastener assemblies
US4375122A (en) * 1980-04-07 1983-03-01 Sps Technologies, Inc. Method and apparatus for tightening threaded fastener assemblies
US4520446A (en) * 1981-12-25 1985-05-28 The Japan Steel Works, Ltd. Apparatus for controlling a plurality of stud tensioning devices
US4450727A (en) * 1982-04-29 1984-05-29 Gse, Inc. Digital retorque measuring apparatus
US4667389A (en) * 1985-03-01 1987-05-26 Hasha Brian B Apparatus and method for connecting two threaded members
US4845998A (en) * 1988-02-01 1989-07-11 Kent-Moore Corporation Apparatus for precision tensioning of threaded fasteners
US5284217A (en) * 1990-10-09 1994-02-08 Allen-Bradley Company, Inc. Apparatus for tightening threaded fasteners based upon a predetermined torque-angle specification window
US5212862A (en) * 1990-10-09 1993-05-25 Allen-Bradley Company, Inc. Torque-angle window control for threaded fasteners
US5131130A (en) * 1990-10-09 1992-07-21 Allen-Bradley Company, Inc. Torque-angle window control for threaded fasteners
US5402688A (en) * 1993-03-17 1995-04-04 Sumitomo Metal Industries, Ltd. Method and apparatus for determining the tightened condition of a pipe joint
US5615130A (en) * 1994-12-14 1997-03-25 Dallas Semiconductor Corp. Systems and methods to gather, store and transfer information from electro/mechanical tools and instruments
US5787018A (en) * 1994-12-14 1998-07-28 Dallas Semiconductor Corporation Systems and methods to gather, store, and transfer information from electro/mechanical tools and instruments
US6502458B1 (en) * 1995-11-14 2003-01-07 Siemens Aktiengesellschaft Method for checking the operational readiness of a valve
GB2339911A (en) * 1998-07-20 2000-02-09 Univ Bristol Apparatus and method for measuring the resistance to rotation of a dental implant.
EP2340424A4 (en) * 2008-10-22 2015-03-04 Atlas Copco Ind Tech Ab TEST METHOD AND TOOL TO TEST FIXED FASTENINGS
CN106500903A (zh) * 2016-09-19 2017-03-15 北京大学 一种基于扭矩信号的特殊扣拧接质量的监测方法
CN106500903B (zh) * 2016-09-19 2019-01-15 北京大学 一种基于扭矩信号的特殊扣拧接质量的监测方法
CN113358266A (zh) * 2021-06-29 2021-09-07 神龙汽车有限公司 螺栓装配张紧力测试方法
SE2330062A1 (en) * 2023-02-07 2024-08-08 Atlas Copco Ind Technique Ab Control device and method for setting upper and lower limit curves for one or more tools arranged to apply fasteners

Also Published As

Publication number Publication date
JPS5467300A (en) 1979-05-30
IT7851404A0 (it) 1978-10-06
GB2006963A (en) 1979-05-10
IT1106553B (it) 1985-11-11
DE2843810C3 (de) 1996-06-20
DE2843810A1 (de) 1979-04-19
JPS6363356B2 (it) 1988-12-07
DE2843810C2 (it) 1990-05-17
BR7806648A (pt) 1979-05-02
GB2006963B (en) 1982-06-30
SE412647B (sv) 1980-03-10
SE7711273L (sv) 1979-04-08
FR2405476A1 (fr) 1979-05-04
FR2405476B1 (it) 1983-08-26

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